--- a/src/Predicates.v Sat Jan 03 19:57:02 2009 -0500+++ b/src/Predicates.v Sun Jan 04 08:18:59 2009 -0500@@ -354,7 +354,7 @@ ex_intro : forall x : A, P x -> ex P ]] *)-(** [ex] is parameterized by the type [A] that we quantify over, and by a predicate [P] over [A]s. We prove an existential by exhibiting some [x] of type [A], along with a proof of [P x]. As usual, there are tactics that save us from worrying about the low-level details most of the time. *)+(** [ex] is parameterized by the type [A] that we quantify over, and by a predicate [P] over [A]s. We prove an existential by exhibiting some [x] of type [A], along with a proof of [P x]. As usual, there are tactics that save us from worrying about the low-level details most of the time. We use the equality operator [=], which, depending on the settings in which they learned logic, different people will say either is or is not part of first-order logic. For our purposes, it is. *) Theorem exist1 : exists x : nat, x + 1 = 2. (* begin thide *)